Description:Tens of thousands of pilgrims from around the world gathered in St Peter's Square on Wednesday (February 27) for Pope Benedict's last general audience before he takes the historic step of becoming the first pontiff in some six centuries to step down instead of ruling for life. The general audience is a weekly event which would normally be held in a vast auditorium in winter, but has been moved outdoors to St. Peter's Square so more people can attend.(0:51)